Dump car



Nov. 21, 1933. I

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mm? on Filed March 3, 1930 5 Sheets-Sheet 5 Now 21, 1933.

Patented Nov. 21, 1933 UNITED STATES PATENT OFFICE DUMP CAR William L. Burner, Columbus, Ohio, assignor to Western Wheeled Scraper Company, Aurora, Ill., a corporation of Illinois Application March 3, 1930. Serial No. 432,783

28 Claims.

More particularly, the invention is concerned th the mechanism for controlling the movement of these side doors. One of the general objects of the invention is to provide improvements in this door controlling mechanism which will permit interruption of the downwardly swinging motion of the door on the dumping side without injury to the door controlling mechanism or door, or without interfering with the continued tilting of the bed. Thus, if in the dumping operation, this door on the dumping side should strike a previously dumped pile of material or should strike any other obstruc tion which would prevent the full normal lowering movement of the door, the door can stop at this point without injury to itself or to its controlling mechanism, and without interfering with the full range of tilting movement of the bed.

A further object of the invention is to provide improved door controlling mechanism wherein the instrumentalities for controlling each door are normally disposed to the same side of the longitudinal medial center line of the car as the door controlled-thereby. The present embodiments of door controlling mechanism are particularly adapted to cars wherein the bed is tilted to dumping position about fulcrum supports spaced laterally from this longitudinal medial center line of the car, although this particular arrangement of the pivotal supports of the bed is not essential.

Other objects of the invention will appear from the following detailed description thereof. In the accompanying drawings illustrating certain preferred embodiments of the invention:- Figure 1 is an end elevational view of the car with the bed upright and the doors closed, parts being broken away in section;

Figure 2 is a similar fragmentary view, illustrating in dotted lines and in full lines two positions of the bed in its movement to dumping position;

view taken approximately on the plane of line 3-3 of Figure 1;

Figure 4 is a fragmentary end view of a modified construction, illustrating in full lines and in dotted lines the normal and. tilted positions of the bed;

Figure 5 is another similar view in transverse section, illustrating another embodiment of the door controlling mechanism of my invention;

Figure 6 is a similar sectional view of still another embodiment; and

Figure 7 is a fragmentary sectional view of another embodiment somewhat similar to Figure 6.

Referring first to theconstruction illustrated in Figures 1, 2 and 3, the car comprises an under frame designated '10 in its entirety, a tilting bed 11, and side doors 12, 12. The under frame 10 is of any conventional construction, usually comprising two longitudinally extending I-beams 13 having appropriate journal mounting on the car Wheels 14. At different points along the length of the car there are provided bolsters or like transversely extending frame members 15 which are rigidly secured to the longitudinally extending beams 13. These transverse frame members 15 are provided with the stationary fulcrum supports about which the bed 11 tiltsin the dumping operation, such fulcrum supports consisting of downwardly extending notches or recessed bearing surfaces 16, 17. The frame of the tilting bed 11 may be of any suitable construction, such frame portion being indicated at 18, and extending downwardly from this frame structure are brackets 19 which carry fulcrum pins 21, 22 at each side of the bed, adapted for cooperation with the recessed fulcrum supports 16, 17. The arrangement of these two fulcrum pins on each bracket 19 is best illustrated at the elevated righthand side of the car in Figure 2. 'When the bed is in the normal transport position illustrated in Figure 1 its weight and that of its load is preferably borne upon the top surfaces of the longitudinal I-beams 13, or upon a joining plate secured thereto, the inner fulcrum pins 21 being slightly spaced from the bottoms of the inner bearing recesses 16 at this time. When the bed starts to tilt in either direction, as to the left in Figure 2, the inner fulcrum pin 21 on this side engages with the bottom of its fulcrum recess 16 in the first part of the tilting movement, and thereafter during a considerable part of such movement the bed tilts about the longitudinal axis of the pin 21. As the bed continues to tilt towards the limit of its dumping movement the outer fulcrum pin 22 on this side engages with the bottom of its associated fulcrum recess 1'7, and thereafter the load is transferred to this outer pin and the final movement of the bed is around the longitudinal axis of that pin. It will be observed that by shifting the point of pivotal support outwardly in this manner during the dumping operation, the bed can be swung up to a steeper angle without the possibility of the center of gravity of the bed passing beyond the vertical plane of the fulcrum support. It will be understood that if this occurred it would be necessary to exert power on the bed to restore it to normal position, and such is undesirable. The depths of the bearing recesses 16 and 17 are so related to the relative heights of their respective fulcrum pivots 21 and 22 that the transposition of the fulcrum point from the inner pin to the outer pin results in the center of gravity of the bed being lowered. Such lowering of the center of gravity during the tilting movement of the bed reduces the amount of power necessary to dump the bed. While the foregoing constitutes the preferred manner of mounting the bed for dumping movement, nevertheless it will be un derstood that the invention can be embodied in constructions where there is only a single laterally spaced fulcrum at each side of the car, or where the bed is mounted to tilt in any other manner.

It will be understood that these fulcrum pins 21, 22 and bearing sockets 16, 1? are located at a plurality of points along the length of the car.

Any conventional arrangement Qfair cylinders, mounted on the car, may be employed for tilting the bed, or the latter may be'tilted by a suitable device disposed alongside the trarl; both types of mechanisms being old and well known.

The doors 12, 12' have downwardly extending pivot lugs 24 at their lower edges which have hinge mounting on "pivot pins 25 carried by brackets extending outwardly from the frame 18 of the bed. At each end of the bed a bar or arm 26 is secured to the end of the door and extends inwardly therefrom. The door controlling mechanisms are disposed at the ends of the bed to act on these arms, and inasmuch as the instrumentalities employed to control each door are duplicates on opposite sides of the car I shall describe only one of these mechanisms. At the inner end of the arm 26 is mounted a pivot pin 27, to which a link 28 is pivotally connected. This link is preferably adjustable in length, as by constructing the inner section thereof with a threaded outer end and by constructing the outer section in the form of an internally threaded sleeve 29 adapted to screw over the inner section, this outer sleeve portion 29 being formed with the eye which receives the pivot 2'7. By removing this pivot the sleeve section 29 can be screwed inwardly or outwardly to adjust the effective length of the link 28. The inner end of said link is pivotally connected at 31 to the lower arm of a lever 32 which is pivotally mounted intermediate its ends on a pivot stud 33 supported on the end of the bed 11. The upper arm of said lever has an offset portion 34 which carries a pivot pin 35 to which one end of a link 36 is connected.

The other end of said link is pivotally connected at 3'7 to a curved rider member 38. The lower end of this rider member is pivotally mounted at 39 on a bracket 41 depending from the underside of the bed frame 18. In the arrangement illustrated the pivot 39 is located substantially coaxially of the inner fulcrum pin 21, be-

ing spaced endwlse therefrom; this, however, is not essential as the pivot 39 may be located at different points so long as the inner curved surface of the rider member 38 will have proper coaction with its associated roller 42 in the tilting movement of the bed.

There are two of these rollers 42, one for each of the two opposite rider members 38, these two rollers being coaxially mounted on a pivot 43 disposed substantially in the vertical medial plane of the car. Referring to Figure 3, these rollers are mounted between inner and outer plate portions 44 forming the inner and outer sides of a U-shaped bracket which is fixedly secured to the tops of the sill beams 13, the ends of the pivot pin 43 being mounted in these plate portions. The upper edges of these plate portions extend above the rollers 42, 42', thereby forming the sides of a channel shaped guideway, the bottom of which is defined by the rollers 42, 42'. The rider members 38 move in this guideway in the tilting of the bed, with their curved inner surfaces bearing against the rollers. It is preferable, although not necessary, to provide an individual roller for each of the two rider members 38, 38', because when the bed is being tilted, as to the left in Figure 2, the right-hand rider member 38' has considerable rolling movement on its roller whereas the left-hand rider member 38 has little if any rolling movement on its roller, and, conversely,-when the bed is tilted in the other direction the opposite is true.

Any suitable arrangement may be employed for preventing each rider member from engaging with the other roller, as, for example, by the provision of a suitable dividing partition between the rollers. Another arrangement, which I have shown in the present construction, is to provide a groove 45 on the irmer side of the member 38, running throughout the length of its curved inner surface, with this groove disposed in the plane of the opposite roller, and forming a like groove 45' in the other rider member 38', but along the opposite side of this curved inner surface, and with this groove lying in the plane of the roller engaged by the opposite rider member 38. These curved inner surfaces of the rider members are arcs which are preferably substantially concentric with the inner fulcrum pivot 21 on the opposite side of the car.

Stop means are provided for limiting the downward folding movement of the door on the dumping side, so that the motion of such door will be stopped, relatively to the bed, when the door is extending substantially parallel with the bed to serve as a chute at the side thereof, see Figure 2. Such stop means may be in the form of an extension on the door projecting below the hinge line and adapted to engage the frame of the bed, or such stop means may be arranged to coact with the link mechanism controlling the door. The latter arrangement is shown, and comprises a stop bracket 47 secured to the end of the bed' at each side thereof and adapted to be engaged by a cooperating stop shoulder 48 projecting from the inner or rear side of the motion reversing lever 32. These stops come into engagement with each other when the dumping door is extending as a substantially parallel prolongation of the bottom of the bed, as shown in Figure 2, preventing further downward pivotal movement of the door relatively to the bed. In addition, these stops prevent the pivot pins 31 from moving into a dead center or past center locking relation with respect to the pivots 2'7 and 33. Each motion reversing lever 32 is preferably constructed of two duplicate plates or bars secured together in spaced relation. The outer link 281s mounted on the pivot pin 31 between these two sections, and, likewise, the upper end of the inner link 36 is also mounted on the pivot pin 35 between such sections, as shown in-Figure 3. The stop shoulder 48, carried by said lever, is secured to the inner or rear bar section of the lever.

With reference to the operation of the door controlling mechanism, it should be particularly noted that the weight of the load pressing against the doors and tending to swing the same outwardly establishes a force which is reversed through the motion reversing levers 32 to create an inwardly acting pressure causing the arcuate rider to press inwardly against its companion roller 42 or 42. Referring to Figure 2, as the bed starts to tilt downwardly towards the left the weight of the bed'and its load is first transposed to the inner line of fulcrum pivots 21 as these pivots engage the bottoms of the recesses 16. The bed continues to tilt about these inner fulcrum pivots until it reaches approximately the position illustrated in dotted lines in Figure 2. this movement, the rider member 38' on the elevating side of the bed is rolling along its roller 42 through a path substantially concentric with its curved inner surface, such member thereby maintaining the door on the rising side of the bed closed. The other rider member 38 remains in approximately the same relation to its roller 42, but the downward swing of the lever pivot 33 with the tilting movement of the bed allows the motion reversing lever 32" at this side to swing in a clockwise direction. progressively as the bed tilts downwardly.

Hence the door 12 at this side is mitted to open, it being noted that such ope movement follows entirely from the action of gravity on the door and the pressure of the load thereagainst, this downwardly swinging movement of the door being continuously controlled in the descending direction through the action of the levers 32 transmitting the door opening force as a pressureto the rider member 38. When the bed passes beyond the dotted line position illustrated in Figure 2 the remainder of the tilting movement is transposed to the outer line of fulcrum pivots 22 around which the bed continues to tilt until it reaches its maximum angle. It is during this last part of the tilting movement that the main dumping 1 operation occurs, at which time the pressure ofxthe load is relieved from the door on the rising side and such door tends to remain closed under its own weight. Hence, it is permissible to have the other rider member 38, controlling this door, leave its roller 42' during such latter part of the tilting movement because there is no tendency for the upper door to open. When the bed reaches its maximum angle of tilt the lever 32 on the dumping side brings its stop 48 up against the flxed'stop 47 on the bed, thereby interrupting further pivotal movement of the dumping door and holding said door substantially in parallelism with the bottom of the bed, as illustrated in Figure 2. It will be observed that, if at any point in the tilting movement of the bed, the door at the dumping side should strike a pile of material or any other obstruction which would prevent its opening, the door is free to remain at this angle or position while the bed continues to tilt, even up to the point where the door is closed against the side of the bed. Such follows by reason of the During ability of the rider member 38 to be withdrawn out of contact with roller 42.

When the bed is tilted back to its normal position the lever pivot 33 swings in an arc toward the roller 42, thereby creating a compression thrust in the inneror upper link 36 and revolving said lever in a counter-clockwise direction to force the opened door upwardly and to closed position against the side of the bed. The rider member 38' on the other side of the bed resumes its pressure relation against its roller 42' for maintaining the other door positively closed. It will be evident that a tilting of the bed in the opposite direction merely results in a reversal of these door controlling operations.

In Figure 4 I have illustrated a modified construction using this same general relation of rider members bearing on the centrally disposed rollers, but in this embodiment the controlling connection with the door is established below the pivot or hinge line of the door. These rider or pressure members 38, 38 have their inner faces similarly curved on arcs substantially concentric with the axes of the opposite inner fulcrum pins 21, and such members bear on their respective rollers in substantially the same relation as described of the preceding embodiment. The pivots 39 upon which said members are mounted are shown as being disposed inwardly from these inner fulcrum pivots, which may also be true of the above described embodiment. In this instance these pressure members are constructed substantially in the form of bell-crank levers having outwardly extending arms 51. These arms carry pivots 52 to which links, similar to the previously described links 28, are pivotally connected. Said links have the same relation of inner threaded sections screwing into outer sleeve sections 29, for the purpose of adjustin the effective lengths of, such links.

The outer end of the sleeve section 29 is pivotally connected at 55 to an arm 56 extending downwardly from the door, below the hinge axis 25. As described of the preceding embodiment, there is a pair of these rider or pressure members at the opposite end of the bed connected through a similar link arrangement with depending arms at the oposite ends of the doors. It will be noted that in this embodiment the load pressure and the weight of the door tending to swing the door outwardly also establishes a pressure in the associated rider member 38, 38' tending to hold such rider member pressed against its respective roller.

As the bed is being tilted to dumping position, such pressure member on the rising side rides along this roller through almost the entire range of tilting movement for holding its door closed. At the dumping side, the hinge axis 25 of the door swings downwardly and away from the pivot center 52, thereby allowing the lower door controlling pivot 55 to swing inwardly and upwardly relatively to the bed. Hence, the door at this side swings downwardly progressively with the tilting of the bed, its downfolding movement being controlled through the entire tilting operation. At thecompletion of the tilting movement the door is held substantially parallel with the bottom of the bed, any tendency of the door to continue downward movement beyond this position being resisted by the inability of the link 28 to move upwardly to any higher point because of the pressure engagement which the rider member 38 has .at this time with its respective roller.

Loo

If, atlany time throughout the entire range of tilting movement, the door should strike an obstruction, it can remain in that position while the bed continues to tilt, even up to the point of having the door closed against the side of the car, any such interrupted movement of the door merely causing the associated rider member 38 to be swung away from its respective roller. When the bed is swung back to normal position the thrust established in the link 28 swings the door back up against the bed and holds it there in locked condition. By making the links 28 adjustable in length, in this and in the previously described embodiment, any wear of the parts, springing of the door, or other condition arising which might prevent the door from being completely closed, can be compensated for by adjusting these links to a different length; and, similarly, if the door is closed too forcibly or under an excessive pressure such can also be corrected by reversely adjusting these links.

In some instances, as when handling wet and sticky materials, it may be desirable to give the door on the rising side a slight opening movement substantially at the beginning of the dumping operation so as to release the material tending to adhere'to this door and to this side of the bed. Such action can be obtained in either of the previously described embodiments by having the inner surfaces of the rider members 38, 38' curved on an are which is not concentric with the opposite fulcrum pin 21 but which is concentric with some other point, such as a center slightly below such fulcrum pin 21. By this arrangement, as the bed tilts, the rider member on the rising side of the bed is permitted to pivot or swing slightly toward its respective roller, thereby permitting its controlled door to swing outwardly through a slight movement near or through the beginning of the dumping operation so as to release the material at the rising side.

Ineach of the above described embodiments, it will of course be understood that the tilting of the bed may occur solely about the fulcrum trunnions 21 and that the second set of trunnions 22 may be omitted.

In Figure 5 I have illustrated an embodiment wherein the door controlling mechanism is disposed below the bed, the latter having tilting movement about laterally spaced fulcrums substantially as described of the preceding embodiments. Each door controlling mechanism comprises an inner link 61 and an outer link 62, pivotally connected together at 63. The inner end of the inner link is pivotally connected at 64 to a bracket 65 which is secured to the underframe on the same side thereof as the door controlled by said mechanism. The outer end of the outer link 62 is pivotally connected at 66 to an arm 56 extending downwardly from the door, below the hinge axis thereof. The outer link 62 is constructed of two sections having a oneway or lost motion operating connection therebetween which permits the effective length of said link to lengthen on the rising side of the bed. The two sections consist of the outer section 67 and the inner section 68, the pivot eye for receiving the pivot 63 being formed in this 67. When the bed is in its normal position, as

these two link sections abut each other, at this time forming a rigid link structure capable of resisting compression stresses for holding its respective door closed.

When the bed tilts to dumping position, as illustrated in dotted lines, the outer link section 67 on the rising side is free to slide outwardly along the guide rod 69 of the inner section, thereby permitting the link to lengthen for accommodating such movement of the bed.

The movement of the pivot joint 63 may, if desired, be guided on the dumping side of the bed by a guide track 73 secured to the underside of the bed and disposed above each link assembly. For cooperating with this track, a guide roller 74 may be mounted on the pivot pin 63. The track preferably slopes inwardly and downwardly toward the center of the bed and has a downwardly curved end, as shown.

As the bed starts to tilt to dumping position the door on the rising side is maintained substantially closed until the pressure of the load is removed therefrom and the bed has tilted to an angle where the weight of the door tends to retain it in closed position, the two sections 67 and 68 of the outer link having no appreciable separating movement until after this point has been passed. On thedumping side the pivot 66 is permitted to swing inwardly and upwardly relatively to the frame of the bed, the roller 74 traveling inwardly along its track 73 progressively with the tilting of the bed and controlling its door so that it is lowered gradually, without any sudden dropping. In the final dumping position the arm 56 engages the underside of the bed frame and holds the door extending substantially parallel with the bottom of the bed. If the descending door should strike an obstruction it can stop and remain in that position, the outer section 67 of the outer link then sliding outwardly along the guide rod 69 with the continued tilting of the bed.

It will be understood that there will be a plurality of these door controlling mechanisms located at different points along the length of the car; and, if desired, this type of door controlling mechanism may be employed in conjunction with either of the previously described embodiments, such embodiments operating at the ends of the bed and the construction shown in Figure 5 being disposed at intermediate points along the car, underneath the bed.

In the construction shown in Figure 6, the bed tilts about the laterally spaced fulcrums 21, and the door controlling mechanism comprises extensible links 77 also having a one-way or lost motion operating relation permitting the descending door on the dumping side of the car to have its movement interrupted independently of the continued tilting of the bed. Each of these links comprises an inner section 78 and an outer section 79 which have relative sliding movement by forming the inner section with a reduced guide extension 81, the outer section 79 being constructed in the form of a sleeve adapted to have relative telescopic movement over the reduced outer portion 81. The inner section 78 is pivotally connected with the underframe on a pivot 82 supported on a bracket 83, and the outer section 79 is pivotally connected at 84 with an extension of the door depending below the hinge axis thereof. When the bed is in its normal, righted position, the two sections of each door controlling link are at the inner limit of their relative telescopic movement,

with the shoulders 86 abutting, such links thenv functioning as rigid compression struts for holding the doors closed against the pressure of the load and their own weight. As the bed starts to tilt the link '77 on the rising side is permitted to extend in length by virtue of such telescopic connection, but there is no appreciable ,extension thereof until after the pressure of the load is removed from the rising door, so that the door is retained substantially closed by the link 7'7 until after the bed has tilted 'to a point where the door will remain closed. under its own weight. On the dumping side, the door swings down gradually with the tilting movement of the bed; the link 77 on this side functioning as a stiff compression member for controlling the entire movement of the door. When the bed reaches the maximum tilting angle this door is held substantially parallel with the bed either through the link 77 or through separate stop means. If the descend ing door should strike an obstruction, it can remain in that position, the link '1'? .merely extending in length with the continued tilting of the bed.

In Figure 71 have shown a construction similar to Figure 6 except that each door controlling link '77 has its inner point of pivotal connection 82 with the under frame located on the same side of .the longitudinal medial plane of the car as the door controlled by said link. Each link comiirlses the inner section '78} and the outer section 19', with the inner section constructed with a reduced portion 81' sliding in the sleeve formation of the outer portion 79'. In this embodiment, the trunnion pins 21' are mounted in bearing recesses 16' which are widened slightly transversely of the inner frame so as to permit the trunnion pin at the dumping side to roll or slide inwardly slightly in the dumping operation. This coinpensates forthe fact that on the rising side of the bed, the link 77' swings through an arcof shorter radius than the arc which would normally be inscribed about the opposite fulcrum pin 21'. The door on the rising side is positively held closed during the tilting movement, and the descending door on the lowering side is free to move orto be stopped during the continued tilting of the bed, this permissive opening of the dumping door following from the lost motion or one-way operating relation of the telescopic link sections '78 and 19'. In'the righting of the bed ,ithe compression force established in the link '77 on the dumping side shifts the bed back to its normal position with the fulcrum pins 21 disposed at the outer ends of their slotted bearing recesses 16'.' If desired, the bottom of each slotted bearing recess 16' may be sloped upwardly at a slight angle towards its inner end and each fulcrum pin 21' may comprise a roller for rolling along said bottom surface, whereby the weight or the bed will tend to roll the fulcrum roller at the dumping side back towards the outer end of said sloping bearing recess. These bearing recesses may be made narrow, as shown in Figs. 1 to 6, without provision for lateral shiftm of the fulcrums 21', by arranging each door 12, 12' so that the ends thereof fit between the endfi of the bed, or so that each door does not in itse close againstthe ends of the 'bed, but has a guard plate thereon at each end adapted to extend in overlapvina relation on the outer side of the end wall of the bed to close the slight space between the door and the end wall of the bed. In either of these constructions the door on the rising side can have a slight inward movement with respect to the bed so that there is no necessity of any lateral shifting of the fulcrums 21'. In all of the above embodiments it will be understood that the construction at the right hand side of the car is a duplicate of that shown of the left hand side. 1

While I have shown what I consider to be the preferred embodiments of my invention, nevertheless, it will be understood that such are merely exemplary and that numerous modifications and rearrangements may be made without departing F from the essence of the invention.

I claim: t

1. In a dump car, the combination of an under frame, a tilting bed rockable about a fulcrum axis relatively to said under frame, a side door for said bed pivotally connected therewith, and door controlling mechanism comprising a member curved substantially concentrically with said fulcrum axis carried by the bed, and means operatively connecting said member with said door.

2. In a dump car, the combination of an under frame, a tilting bed rockable about a fulcrum axis relatively 'to said under frame, a side door for said bed pivotally connected therewith, and door controlling mechanism comprising a member curved substantially concentrically with said fulcrum axis and pivotally mounted on said'bed, a guide surface on said under frame on which said curved member has movement in the tilting of the .bed, and means operatively connecting said curved member with said door.

3. In a dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors for said bed pivoted-thereto at each no side thereof, and door controlling mechanism comprising a member curved substantially concentrically with the fulcrum at the opposite side .of the car, a guide surface on the under frame along which said curved member has movement in the tilting of the bed, and means operatively connecting said curved member with one of said doors. I v

4. In a dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors for said bed pivoted thereto at each side thereof, and door controlling mechanism for each door comprising a member mounted on the bed at the same side as the door controlled thereby, said members being curved substantially concentrically with the fulcrums at the opposite sides of theses, guide surfaces on the under frame along which said curved members have movement in'the tilting of the bed, .and means operatively connecting said curved members with their respective doors.

5. In a dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors for said bed pivoted thereto at each side thereof,. and door controlling mechanism for each door comprising a member pivotally mounted on the bed and curved substantially concentrically with the fulcrum at the opposite side of the car, guide surfaces on said under frame along which said curved members have movement in the tilting of the bed, and link mechanism connecting said curved members with .their respective doors.

' 6. In a dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors pivotally connected with said bed to swing outwardly and downwardly to dumping pc- 0 sition, and door controlling mechanism for each door comprising a member pivotally mounted on said bed and curved substantially concentrically with the fulcrum at the opposite side of the car, guide surfaces on said under frame along which said curved members have riding movement in the tilting of the bed, and link means operatively connecting each of said curved members with its respective door whereby said members are normally held against said guide surfaces.

'7. In a dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors for said bed pivoted thereto at each side thereof, roller means carried by said under frame substantially in the longitudinal medial plane of the car, and door controlling mechanism for each door comprising a rider member pivotally mounted on the bed and having one surface thereof curved substantially concentricallythe tilting of the bed, and link means operatively 1 connecting each of said rider members with its respective door.

8. In a dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors for said bed pivoted thereto at each side thereof, roller guide means carried by said under frame and disposed approximately in the longitudinal medial \plane of the car, and door controlling mechanism for each door comprising a rider member pivotally mounted on said bed on the same side thereof as the door controlled thereby, the inner surface of each rider member being curved substantially concentrically with the fulcrum at the opposite side of the car, the curved surfaces of said two rider members having riding movement on said roller guide means in the tilting of the bed, and motion reversing link means operatively connecting said rider members with their respective doors.

9. In a dump car, the combination of an under frame, a tilting bed vrockable selectively about fulcrums at opposite sides of said under frame,

I side doors for said bed pivoted thereto at each side thereof, guide means mounted on said under frame substantially in the longitudinal medial. plane thereof, rider members pivotally mounted on the bed and having riding movement on said guide means in the tilting of the bed, levers pivotally mounted on the bed, and links operatively connecting said levers with said doors and with said rider members.

10. In a dump car, the combination of an under frame, a tilting bed rockable selectively aboutv fulcrums at opposite sides of said under frame, side doors for said bed pivoted thereto at each. side thereof, guide means mounted on said under frame at each end of the car and intermediate the sides thereof, arcuate members pivotally mounted on said bed at the ends thereof and. adapted to have riding engagement on said guide means in the tilting of the bed, levers pivotally mounted on the ends of the bed, and links operatively connecting said levers with said doors and with said arcuate members.

11. In a. dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors for said bed pivoted thereto at each side thereof, a guide surface on the under frame, a member movably mounted on the car for controlling each door having a surface curved substantially concentrically with the fulcrum at the opposite side of the car, the curved surfaces of both of said members having movement on said guide means in the tilting of the bed in opposite directions, and means operatively connecting said curved members with their respective doors below the pivot axes of the doors.

12. In a dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors for said bed pivoted thereto at each side thereof, a guide surface on the under frame, and door controlling mechanism for each door comprising a member curved substantially concentrically with the fulcrum at the opposite side of the car, the curved surface of said member having movement on said guide surface in the tilting of the bed, arms extending from said curved members, and link means operatively connected between said arms and the lower portions of the doors.

13. In a dump car, the combination of an under frame, a tilting bed, rockable, selectively about fulcrums at opposite sides of said under frame, side doors for said bed pivoted thereto at each side thereof, and door controlling mechanism for each door comprising a member mounted on the bed on the same side of the car as the door controlled thereby, means operatively connecting each of said members with its respective door, and means on said under frame in substantially the vertical medial plane of said car with which the member at the rising side has bearing engagement during substantially the entire tilting movement of the bed, said door controlling mechanism permitting the descending door on the dumping side to move or to be stopped during the tilting of the bed.

14. In a dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors for said bed pivoted thereto at each side thereof, and door controlling mechanism for each door comprising arcuate members pivotally mounted on the bed at the same side thereof as the door controlled thereby, means operatively connecting said arcuate members with their respective doors, guide means on said under frame with which the arcuate member at the rising side of the bed has bearing engagement until the bed has tilted to the point where gravity will hold the door on the rising side closed, said door controlling mechanism-permitting the descending door on the dumping side to move or to be stopped during the continued tilting of the bed.

15. In a dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors for said bed pivoted thereto at each side thereof, and door controlling mechanism for each door comprising pressure members movably mounted on the bed at a point below the plane of the load carrying surface of said bed and on the same side thereof as the door controlled thereby, guide means mounted on the under frame, said guide means being disposed at a point above the pivotal connections of said pressure members with said bed, and means operatively connecting said doors with their respective pressure members whereby outwardly acting pressure on the doors tends to press said pressure members inwardly against'said guide means.

16. In a dump car, the combination of an under frame, a tilting bed rockable selectively about fulcrums at opposite sides of said under frame, side doors for said bed'pivoted thereto at each side thereof, and door controlling mechanism for each door comprising a curved door controlling member mounted on the bed and disposed entirely on the same side of the car as the door controlled thereby, means operatively connecting each of said members with its respective door, and guide means mounted on the under frame with which said curved members have engagement, said each door comprising a membercurved substantially concentrically with the fulcrum at the opposite side of the car, means operatively connecting said member with said door, and means for shifting the pivotal center around which said bed tilts. I p

18. In a dump car, the combination of an under frame, a tilting bed mounted thereon, means comprising dual pivots-at each side of, the car adapted to alternately support the bed on said under frame during a tilting movement to either side, side doors pivotally connected with the bed to swing outwardly and downwardly to their dumping position, door controlling mechanisms for each door comprising a member curved substantially concentrically with one of the dual pivots at the opposite side of the car, and means operatively connecting said member with said door.

19. In a dump car, the combination of an under frame, a tilting bed mounted thereon, means comprising inner and outer pivots at each side of the car adapted to alternately support the bed on said under frame during a tilting movement to either side, side doors pivotally connected with saidbed to swing outwardly and downwardly to their dumping position, door controlling mechanisms for each door comprising a member curved substantially concentrically with the inner pivot at the opposite side of the car, and means operatively connecting said member with said door.

20. A dump car comprising an underframe, a tilting bed mounted thereon, a side door connected with the bed to swing downwardly into open position, and mechanism for controllingthe operation of said door comprising a curved member pivotallymounted on said bed concentrically with the tilting axis thereof, link means connecting said curved member with said door,

nected with the bed to swing downwardly into open position, and mechanism for controlling, the operation of said door comprising a curved member pivotally mounted at one end on said bed concentrically with the tilting axis thereof, .link

I means connected with said curved member intermediate the ends thereof and with said door, and a guide surface on said underframe with which the upper end of said curved member has bearing engagement in the normal transport position of said bed, and on which said member has sliding movement during a tilting movement of said bed. v

22. In a dump car, the combination of an underframe, a tilting bed mounted thereon, means comprising dual pivots at each side of the car adapted to alternately support the bed on said underframe during a tilting movement to either side, side doors pivotally connected with the bed to swing outwardly and downwardly to their ,dumping position, door controlling mechanisms for each door comprising a curved member pivotally mounted on the bed coaxially with .one of the dual pivots which support said bed',

and means operatively connecting said member with said door. 7

23. In a dump car, the combination of an underframe, a tilting bed mounted :thereon, means comprising inner and outer pivots located at each side of the car and adapted to alternately support thebed on said underframe during a tilting movement to either "side, side doors pivotally connected with the bed, to swing outwardly and downwardly to their dumping position, door controlling mechanisms for each door comprising a curved member pivotally mounted on the bed coaxially with the inner pivot of said bed supporting means, and means operatively connecting said member with said door.

24. A dump car comprising an underframe, laterally spaced fulcrum supports stationarily disposed on said underframe adjacent to the outer sides thereof, a tilting bed supported in substantially .stable equilibrium on said underframe and comprising laterally spaced fulcrums stationarily mounted on said bed and adapted to cooperate with said laterally spaced fulcrum sup- .ports, said bed being operative to dump to either side about said laterally spaced fulcrums, side gates at opposite sides of the bed hingedly connected with the bed to swing outwardly and downwardly from the side of the bed to open position in the dumping operation, and gate control mechanism for each gate operative. at the dumping side to allow the gate to be opened by gravity or to permit the gate to be stopped by an obstruction during continued dumping movement the rising side to positively hold the gate closed,

each of said gate controlling mechanisms comprising a rider'member pivotally mounted on the bed, motion transmitting linkage operatively associated between. said rider member and its respective gate to control the opening and closing movements of said gate, and a device pivotally connected with said underframe and against which device said rider member is adapted to bear, said rider member being movable out of engagement with said device. Y

25. A dump car-comprising an underframe, laterally spaced fulcrum suppor s stationarily disposed on said underframe adjacent to the outer sides thereof, a tilting bed supported in substantially stable equilibrium on said underframe and comprising laterally spaced fulcrums stationarily mounted on said bed and adapted tov cooperate with said laterally spaced fulcrum supports, said bed being operative to dump to either side about said laterally spaced fulcrums, side gates at opposite sides of the bed hingedly' connected with the bed to swing outwardly anddownwardly from the side of the bed to open position in the dumping operation, and gate control mechanism for each gate operative at the dumping side to allow the gate to be opened by gravity or to permit the gate to be stopped by an obstruction during continued dumping movement of the bed and serving to positively close the gate during the righting movement, and operative at the rising side to positively hold the gate closed, each of saidgate controlling mechanisms comprising a pivoted member pivotally mounted on the end of the bed whereby a portion of said pivoted member can project above the plane of the load carrying surface of said bed, motion transmitting mechanism operatively associated between said pivoted member and its respective gate to control the opening and closing movements of said gate, and a cooperating member connected with said underframe and against which said pivoted member is adapted. to bear, said pivoted member being movable into .and out of engagement with said cooperating member.

26. A dump car comprising an underframe, laterally spaced fulcrum supports stationarily disposed on said underframe adjacent to the outer sides thereof, a tilting bed supported insubstantially stable equilibrium on said underframe and comprising laterally spaced fulcrums stationarily mounted on said bed and adapted to cooperate with said laterally spaced fulcrum supports, said bed being operative to dump to either side about said laterally spaced fulcrums, side gates at opposite sides of the bed hingedly con nected with the bed to swing outwardly and downwardly from the side of the bed to open position in the dumping operation, and gate control mechanism for each gate operative at the dumping side to allow the gateto be opened by gravity or to permit the gate to be stopped by an obstruction during continued dumping movement of the bed and serving to positively close the gate during the righting movement, and operative at the rising side to positively hold the gate closed, each of said gate control mechanisms comprising a pivoted member pivotally mounted on the bed on a pivot axis disposed intermediate the longitudinal center line of the bed and the hinge axis of the gate controlled by that member, motion transmitting mechanism operatively associated between said pivoted member and its respective gate to control the opening and closing movements of said gate, and a cooperating member connected with said underframe and against which said pivoted member is adapted to have rolling bearingengagement, said pivoted member being movable into and out of engagement withsaid cooperating member.

2'7. A dump car comprising an underframe, laterally spaced fulcrum supports stationarily disposed on said underframe adjacent to the outer sides thereof, a tilting bed supported in substantially stable equilibrium on said underframe and comprising laterally spaced fulcrums stationarily mounted on said bed and adapted to cooperate with said laterally spaced fulcrum supports, said bed being operative to dump to either side about said laterally spaced fulcrums,

side gates at opposite sides of the bed hingedly connected with the bed to swing outwardly and downwardly from the side of the'bed to open position in the dumping operation, and gate control mechanism for each gate operative at the dumping side to allow the gate to be opened by gravity or to permit the gate to be stopped by an obstruction during continued dumping movement of the bed and serving to positively close the gate during the righting movement, and operative at the rising side to positively hold the gate closed, each of said gate controlling mechanisms comprising a lever pivotally mounted intermediate its ends on the end of the bed, said lever at the dumping side of the car moving relatively to said bed and to said underframe in the dumping operation, a link pivotally connected between one end of said lever and its respective gate, and means coacting between the other end of said lever and the underframe for controlling the position of said lever relatively to said bed at the dumping side, said latter means comprising two cooperating members arranged to have ,relative sliding contact and capable of relative separating motion with said members out of contact with each other.

28. A dump car comprising an underframe, laterally spaced fulcrum supports stationarily disposed on said underframe adjacent to the outer sides thereof, a tilting bed supported in substantially stable equilibrium on said underframe and comprising laterally spaced fulcrums stationarily mounted on said bed and adapted to cooperate with said laterally spaced fulcrum supports, said bed being operative to dump to either side about said laterally spaced fulcrums, side gates at opposite sides of the bed hingedly connected with the bed to swing outwardly and downwardly from the side of the bed to open position in the dumping operation, and gate con- 115 trol mechanism for each gate operative at the dumping side to allow the gate to be opened by gravity or to permit the gate to be stopped by an obstruction during continued dumping movement of the bed and serving to positively close the gate during the righting movement, and operative at the rising side to positively hold the gate closed, said two gate controlling mechanisms ,comprising two proximate contact members, one individual to each gate, both pivotally connected with said underframe, and spaced from each other longitudinally of the car at one end thereof, two pivoted members at the same end of the car, one individual to each gate, both pivotally mounted on said bed on se 'arate pivot axes, and each coacting with an in idual one of said contact members, each of said pivoted members being arranged for relative traveling motion along and in contact with its individual contact member, and being movable out of engagement with said contact member, and motion transmitting devices operatively associated between said pivoted members and their respective gates for controlling the opening and closing of said gates.

WILLIAM L.- BURNER. 

